Pneumatic motok



Patented De.16, 1919'.

UNITED STATES PATENT m n ADOLPH I. GUSTAFSON, OF CHICAGO, ILLINOIS,ASSIGNOR TO M. SCHULZ 00., OF

- CHICAGO, ILLINOIS.

PNEUMATIC MOTOR.

Specification of Letters Patent.

Patented Dec. 16, 1919.

Application filed May 29, 1918. Serial No. 237,221.

particularly adapted for use in pneumatically operated musicalinstruments, such for example, as player pianos.

One of the ob ects of the invention is to provide a practical andeffective construction of motor having a plurality of operating bellows.

Another object of the invention is to provide a simple and advantageousconstruction of bellows which may be easily and simply constructed, willbe durable in operation and may be readily taken apart for repair orreplacement.

In the accompanying drawings Figure 1 is a front elevation of apneumatic motor embodying my present invention;

Fig. 2 is a cross section on line 2-2 in Fig. 1.

In the drawings I show a motor having a plurality of bellows 111, andarotary shaft 2 driven by said bellows l by means of cranks 3 on theshaft and connecting rods 4: between the bellows and cranks.

As will be seen more particularly in Fig. 2, each bellows 1 consists oftwo parts, an upper pneumatic 1 and a lower pneumatic 1 The upperpneumatic 1 consists of the swinging member 5 and the fixed member 6with the bellows material 7 and a connecting or hinge portion 8. Thelower pneumatic 1 consists of the swinging member 9 and fixed member 10with the hinge 11 and bellows material 12. These two pneumatics arecon-- nected together by means of a board or strip 13 which is securedto the swinging members 5 and 9 as by screws 14. The hinge 11 is of suchcharacter that swinging motion on the part of the bellows member 9 ispermitted, keeping such member 9 in. the proper relative position to thefixed member 10. The hinge or connection 8 of the pneumatic 1 is of suchcharacter as to form a loose or articulated joint or connection betweenthe swinging member 5 and the fixed member 6. Thus the swinging member 5has a certain amount of latitude of motion which it would not have if ithad a hinge such as 11 in the lower pneumatic 1 and consequently thelower pneumatic 1 controls the operation of the two pneumatics, l and 1swinging the board or strip 13 back and forth, and the loosely mountedswinging member 5 accommodates itself to the peculiar motion'which willbe given it by the board 13. This motion will not, of course, be theordinary swinging motion of a loose member of a pneumatic, but insteadwill be not only the opening and closing movement of the member 5, butalso a certain amount of longitudinal bodily movement on the part ofsaid Thus there is perfect freedom member 5. of action on the part ofsaid member 5 and pneumatic 1, and no binding or holding which wouldtend to injure or damage the pneumatic or interfere with its mostefficient operatlon. Furthermore, the fixed member 6 of the pneumatic 1is preferably set down a little lower or a. little farther into thesupporting block of member 20 on which the pneumatics 1 and 1 aremounted. This gives ample room for the collapsing movewhich permits itsswinging member to adjust itself as required by the motion of theswinging member on the other pneumatic.

2. A pneumatic motor comprising a pair of pneumatics. the hinged ends ofwhich are arranged end to end, one-of said pneumatics having itsswinging member provided with a loose connection permitting saidswinging member to adjust itself as required by the motion or" the otherswinging member.

3. A pneumatic motor comprising a pair of hinged pneumatics, with theirhinged ends adjacent to one another and connected so that the swingingmembers of said pneumatics shall move in unison, one of said neumaticshaving its members hinged together and the other being provided with aloose connection formed by a Wide piece 8 10 of cloth.

In witness whereof I hereunto subscribe my name this 1st day of April,A. D. 1918. ADOLPH P. GUSTAFSON.

